EP 0551955 B1 19970813 - System for determining the topography of a curved surface
Title (en)
System for determining the topography of a curved surface
Title (de)
System zur Bestimmung der Topographie einer gekrümmten Oberfläche
Title (fr)
Système pour déterminer la topographie d'une surface courbée
Publication
Application
Priority
NL 9200071 A 19920115
Abstract (en)
[origin: EP0551955A1] A system for determining the topography of a curved surface, comprising a device for projecting patterns of lines on the surface to be examined, which device includes two projectors disposed at an angle relative to each other, each provided with a raster of parallel straight lines, which are positioned at right angles to the plane through the projection axes and a rectangular diaphragm, of which the long sides are parallel to the lines of the raster, and a detection device for registering the image formed on the surface. The system is implemented such that an additive moiré pattern is produced and that a pilot monitor in conjunction with an electronic filter is provided for real-time visualizing this moiré pattern. The detection device is implemented for registering the image without moiré interference, suitable for discrete Fourier analysis. The registration of the formed height line map for proper focussing or for obtaining an end product is electronically filtered, with the object of being able to see highly contrasting moiré height contours in real time on a monitor. The light source for both projectors is a slit shaped continuous light source combined with a slit shaped flashlamp, which - by means of synchronisation at the end of the first raster period and the beginning of the second raster period respectively - illuminate a complete TV raster in only a few ms, and in which the half rasters can complement each other afterwards through explicit digital analysis. <IMAGE>
IPC 1-7
IPC 8 full level
A61B 3/107 (2006.01); G01B 11/25 (2006.01)
CPC (source: EP US)
A61B 3/107 (2013.01 - EP US); G01B 11/2531 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE DK ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0551955 A1 19930721; EP 0551955 B1 19970813; DE 69312975 D1 19970918; DE 69312975 T2 19980305; DK 0551955 T3 19980330; ES 2108203 T3 19971216; JP 2599876 B2 19970416; JP H0771934 A 19950317; NL 9200071 A 19930802; US 5406342 A 19950411
DOCDB simple family (application)
EP 93200102 A 19930115; DE 69312975 T 19930115; DK 93200102 T 19930115; ES 93200102 T 19930115; JP 610393 A 19930118; NL 9200071 A 19920115; US 524493 A 19930115